Silver's price has skyrocketed — but one key factor could cap the rally

Silver is both an investment metal and a key material for solar panels and electronics.

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• Silver's blistering rally may push industrial to cut back or find substitutes, Saxo says.
• Silver prices have surged far faster than gold as investors pile into hard assets.
• Silver is a core material in solar panels, making the industry especially sensitive to rising prices.

Silver has outshone gold in the blistering precious-metals rally...